LTE-A系统中基于DMRS的信道估计算法  

Channel Estimation Algorithm based on DMRS in LTE-A System

作　　者：段红光[1] 田枚[1] 李玉菱[1] 

机构地区：[1]重庆邮电大学重庆市移动通信重点实验室,重庆400065

出　　处：《通信技术》2016年第11期1424-1428,共5页Communications Technology

摘　　要：LTE-A下行传输通信系统中采用了多达8天线端口的增强型MIMO技术,引入了新的参考信号DMRS,用于MIMO下行信道估计。分析LTE-A系统中基于DMRS的信道估计算法,提出了一种低复杂度的频域线性最小均方误差(LMMSE)插值算法。该算法基于DMRS对信道时延参数进行估计,并采用Look Up Table(LUT)方式,选择相应的频域插值矩阵,完成频域LMMSE插值过程。它解决了传统频域LMMSE算法中获取信道二阶统计信息的困难,也避免了对矩阵的实时求逆过程。仿真结果表明,此方法在降低了复杂度的同时保证了BER和MSE的性能,具有较大的实用性。Enhanced MIMO technology with up to 8 antenna ports is employed in the downlink transmission communication system of LTE-A.DM-RS, as a new of reference signal, is introduced for downlink channel estimation in MIMO system. The channel estimation algorithm based on DMRS in LTE-A system is analyzed, then completes LMMSE interpolation process in frequency domain by LUT（looking up table） for selection of corresponding frequency domain interpolation matrix. This solves the difficulty in acquiring the second order statistical information of the channel in the traditional frequency domain LMMSE algorithm, and avoiding the real-time inversion process of the matrix. The simulation results indicate that this method can reduce the complexity while ensuring the performance of BER and MSE, and thus is of fairly great oracticabilitv.

关 键 词：LTE—A 信道估计 DMRS LMMSE LUT 

分 类 号：TN911.23[电子电信—通信与信息系统]